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Ch. 5 - Genetic Linkage and Mapping in Eukaryotes
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172당신이 사용하는 게 아니라요?교과서 변경
5장, 문제 1e

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Progeny of the cross Rt/rT×rt/rt

검증된 단계별 안내
1
Step 1: Understand the problem. The cross involves two parents with specific genotypes: Rt/rT (heterozygous for two genes) and rt/rt (homozygous recessive for both genes). The goal is to determine the progeny genotypes and their arrangement on homologous chromosomes.
Step 2: Draw the homologous chromosomes for the first parent (Rt/rT). Represent the alleles on two homologous chromosomes, with 'R' and 't' on one chromosome and 'r' and 'T' on the other. Ensure the genes are shown in the order written (R and T).
Step 3: Draw the homologous chromosomes for the second parent (rt/rt). Since this parent is homozygous recessive, both homologous chromosomes will carry the 'r' and 't' alleles in the same order.
Step 4: Determine the possible gametes produced by each parent. The first parent (Rt/rT) can produce gametes with the following combinations of alleles: Rt, rT, RT, and rt (depending on recombination). The second parent (rt/rt) can only produce gametes with the 'rt' combination.
Step 5: Use a Punnett square to combine the gametes from both parents and determine the genotypes of the progeny. For each combination, draw the homologous chromosomes showing the arrangement of alleles for the resulting genotype.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
1m

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Alleles and Genotypes

Alleles are different versions of a gene that can exist at a specific locus on a chromosome. Genotypes refer to the genetic constitution of an individual, represented by the combination of alleles inherited from each parent. Understanding how alleles interact and combine is crucial for predicting the traits of offspring in genetic crosses.
추천 영상:
가이드 코스
03:03
New Alleles and Migration

Homologous Chromosomes

Homologous chromosomes are pairs of chromosomes, one inherited from each parent, that contain the same genes but may have different alleles. In a genetic diagram, it is important to represent these chromosomes accurately to visualize how alleles are distributed during meiosis and fertilization, which ultimately affects the genotype of the progeny.
추천 영상:
가이드 코스
07:10
Chromosome Structure

Punnett Square

A Punnett square is a diagram used to predict the genotypes of offspring from a genetic cross. By organizing the alleles of each parent, it allows for the visualization of all possible combinations of alleles in the progeny. This tool is essential for understanding inheritance patterns and calculating the probabilities of different genotypes resulting from a specific cross.
추천 영상:
가이드 코스
18:27
Chi Square Analysis
관련 실천
교과서 질문

Give the information requested.


The gametes produced by an organism with the genotype Rt/rT

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교과서 질문

In a diploid species of plant, the genes for plant height and fruit shape are syntenic and separated by 18 m.u. Allele D produces tall plants and is dominant to d for short plants, and allele R produces round fruit and is dominant to r for oval fruit.


A plant with the genotype DR/dr produces gametes. Identify gamete genotypes, label parental and recombinant gametes, and give the frequency of each gamete genotype.

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교과서 질문

A pure-breeding tall plant producing oval fruit as described in Problem 2 is crossed to a pure-breeding short plant producing round fruit.


The F₁ are crossed to short plants producing oval fruit. What are the expected proportions of progeny phenotypes?

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교과서 질문

Draw a diagram illustrating the alleles on homologous chromosomes for the genotypes given, assuming in each case that the genes reside on the chromosome in the order written.


DFg/DFG

520
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교과서 질문

In a diploid species of plant, the genes for plant height and fruit shape are syntenic and separated by 18 m.u. Allele D produces tall plants and is dominant to d for short plants, and allele R produces round fruit and is dominant to r for oval fruit.


Give the same information for a plant with the genotype Dr/dR.

756
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교과서 질문

Draw a diagram illustrating the alleles on homologous chromosomes for the genotypes given, assuming in each case that the genes reside on the chromosome in the order written.


aBc/abC

435
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